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Date: Wed, 30 Oct 2013 13:19:24 +0200
From: Danis Petkakis <dpetka2001@...mail.com>
To: "john-users@...ts.openwall.com" <john-users@...ts.openwall.com>
Subject: FW: John 1.8.0 format options
Hi Alexander,
First of all thank you for your detailed answer. I saw the options for Openmp in the Makefile, but right
now i'm using john-1.8.0 with --fork option. I have a recent version of ubuntu (13.10), so i guess i will be
fine concerning the latest libcrypt library used to compile john. If i enabled the openmp flags in the
Makefile and built john again, do you think it would make a bigger difference compared to the way i'm
using it right now (I'm using it with --fork option at the moment)? Could you give an example of how I
should run john with OpenMP instead of --fork? Something like this (which i found in a different post)
" OMP_NUM_THREADS=4 ../run/john passwd" would suffice?
Thanks again
Danis
Date: Wed, 30 Oct 2013 12:17:51 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: John 1.8.0 format options
Given the way you've worded your questions, I guess you're referring to
sha256crypt and sha512crypt rather than to raw SHA-256 and SHA-512. If so:
JtR 1.8.0 does not include native support for sha256crypt and
sha512crypt, but it nevertheless supports them if the underlying system
does. That is, if you build and run JtR 1.8.0 e.g. on recent Ubuntu, it
will support these hashes via the system's libcrypt. This will happen
automatically; you do not need to specify any --format option.
Recent jumbo versions include builtin support for sha256crypt and
sha512crypt, which does not depend on the underlying system's support
for these hashes, and it tends to be slightly faster. You also do not
need to specify any format option to make use of this support.
With either version, you may use multiple cores by building with OpenMP
or by using --fork=N (the latter requires 1.8.0+ or bleeding-jumbo).
Since these hashes are of a slow type, OpenMP provides good efficiency
at them, so you do not have to go for --fork.
Alexander
From: dpetka2001@...mail.com
To: john-users@...ts.openwall.com
Subject: John 1.8.0 format options
Date: Wed, 30 Oct 2013 02:43:36 +0200
Hello there, I am a new member on this list and would like to know if the 1.8.0 version
supports md5,sha256 and sha512 hashing algorithms. I have read the release notes of
1.7.9-jumbo version and know that it supports them, but in the release notes of 1.8.0
version I only read that it supports md5crypt and crypt. So does the option crypt support
sha256 and sha512 aswell? Or should I prefer the jumbo version concerning these algorithms?
Thanks in advance,
Danis Petkakis.
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